W DOC AIRBUS | TSM A320F

Abnormal Flashing of the CABIN PRESSURE Warning Light Panels of the Passenger/ Crew Door and Emergency Exits

TASK 52-73-00-810-801-B
Abnormal Flashing of the CABIN PRESSURE Warning Light Panels of the Passenger/ Crew Door and Emergency Exits

1. Possible Causes
  • PRESS SW-CABIN PRESS DET [14WN]
  • wiring from the warning light panel 17WN1 pin D to the warning light panel 17WN2, pin C
  • WARN LT PNL-CABIN PRESSURE, AFT L DOOR [17WN1]
  • WARN LT PNL-CABIN PRESSURE, AFT R DOOR [17WN2]
  • wiring from the warning light panel 20WN2 pin C to the warning light panel 19WN2 pin D
  • WARN LT PNL-CABIN PRESSURE, AFT R EMERGENCY EXIT [20WN2]
  • wiring from the warning light panel 20WN2 pin D to the warning light panel 20WN1 pin C
  • wiring from the warning light panel 20WN1 pin D to the warning light panel 17WN1 pin C
  • WARN LT PNL-CABIN PRESSURE, AFT L EMERGENCY EXIT [20WN1]
  • wiring from the warning light panel 19WN1 pin C to the warning light panel 19WN2 pin D
  • WARN LT PNL-CABIN PRESSURE, FWD L EMERGENCY EXIT [19WN1]
  • WARN LT PNL-CABIN PRESSURE, FWD R EMERGENCY EXIT [19WN2]
  • wiring from the cabin pressure detection pressure switch pin B 14WN to the warning light panel 16WN2 pin C
  • WARN LT PNL-CABIN PRESSURE, FWD R DOOR [16WN2]
  • wiring from the warning light panel 16WN2 pin D to the warning light panel 16WN1 pin C
  • wiring from the warning light panel 16WN1 pin D to the warning light panel 17WN1 pin C
  • WARN LT PNL-CABIN PRESSURE, FWD L DOOR [16WN1]
  • RELAY-ENG2 ON/OFF [18WN2]
  • [3EN2]
  • CTL SW-ENG/MASTER 2 [2KC]
  • RELAY-ENG1 ON/OFF [18WN1]
  • [3EN1]
  • CTL SW-ENG/MASTER 1 [3KC]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 52-73-00-710-004
Operational Test of the Cabin Overpressure Warning-System
ASM 527302
AMM 52-73-12-000-001
Removal of the Cabin-Pressure Detection Pressure-Switch
AMM 52-73-12-400-001
Installation of the Cabin-Pressure Detection Pressure-Switch
AMM 52-73-22-000-001
Removal of the CABIN PRESSURE Warning Light Panel of the FWD Passenger/Crew Door
AMM 52-73-22-000-002
Removal of the CABIN PRESSURE Warning Light Panel of the Aft Passenger/Crew Door
AMM 52-73-22-000-003
Removal of the CABIN PRESSURE Warning Light Panel of the Emergency Exit
AMM 52-73-22-400-001
Installation of the CABIN PRESSURE Warning Light Panel of the FWD Passenger/Crew Door
AMM 52-73-22-400-002
Installation of the CABIN PRESSURE Warning Light Panel of the Aft Passenger/Crew Door
AMM 52-73-22-400-003
Installation of the CABIN PRESSURE Warning Light Panel of the Emergency Exit Door
ASM 761201
ASM 793601
3. Fault Confirmation
Subtask 52-73-00-710-052-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the cabin overpressure warning-system AMM 52-73-00-710-004.
4. Fault Isolation
Subtask 52-73-00-810-051-A ** ON A/C NOT FOR ALL
A. If the CABIN PRESSURE warning light panels flash without overpressure:
  • disconnect the cabin-pressure detection pressure-switch 14WN.
   (1) If the warning light panels of the doors do not flash:
   (2) If the warning light panels of the doors flash:
     (a) Disconnect the connector of the warning light panel 17WN1.
     (b) If the warning light panels of the FWD doors and emergency exits do not flash:
  • do a check for a short to ground at pin D of the connector of the warning light panel 17WN1 ASM 527302.
       1 If there is a short to ground:
  • do a check and repair the wiring from the warning light panel 17WN1 pin D to the warning light panel 17WN2, pin C, ASM 527302
       2 If there is no short to ground:
  • connect the connector of the warning light panel 17WN1 and disconnect the connector of the warning light panel 17WN2.
         a Install a jumper wire between the pin G/H of the connector of the warning light panel 17WN2.
         b If the warning light panels flash at the other doors:
         c If the warning light panels do not flash at the other doors:
     (c) If the warning light panels of the FWD passenger/crew doors and emergency exits flash:
  • disconnect the warning light panel 20WN2.
       1 If the warning light panels of the FWD passenger/crew doors and the FWD and aft left emergency exits do not flash:
  • do a check for a short to ground at pin C of the connector of the warning light panel 20WN2.
         a If there is a short to ground:
  • do a check and repair the wiring from the warning light panel 20WN2 pin C to the warning light panel 19WN2 pin D ASM 527302.
         b If there is no short to ground:
       2 If the warning light panels of the FWD passenger/crew doors and the FWD and aft left emergency exits flash:
  • do a check for a short to ground at pin D of the connector of the warning light panel 20WN2 ASM 527302,
  • disconnect the connector of the warning light panel 17WN1 and do a check for a short to ground at pin C of the connector of the warning light panel 17WN1 ASM 527302.
         a If there is a short to ground:
  • do a check and repair the wiring from the warning light panel 20WN2 pin D to the warning light panel 20WN1 pin C ASM 527302,
  • do a check and repair the wiring from the warning light panel 20WN1 pin D to the warning light panel 17WN1 pin C ASM 527302.
         b If there is no short to ground:
     (d) If the warning light panel of the FWD passenger/crew doors and FWD emergency exits flash:
  • disconnect the connector of the warning light panel 19WN1.
       1 If the warning light panel of the FWD passenger/crew doors and FWD emergency exits do not flash:
  • do a check for a short to ground at pin C of the connector of the warning light panels 19WN1 ASM 527302.
         a If there is a short to ground:
  • do a check and repair the wiring from the warning light panel 19WN1 pin C to the warning light panel 19WN2 pin D ASM 527302.
         b If there is no short to ground:
  • connect the warning light panel 19WN1 and disconnect the connector of the warning light panel 19WN2,
  • install a jumper wire between the pin G/H of the connector of the warning light panel 19WN2.
         c If the warning light panels flash at the FWD passenger/crew doors and FWD left emergency exit:
         d If the warning light panels do not flash at the FWD doors and FWD left emergency exit:
     (e) If the warning light panels of the FWD passenger/crew doors flash:
  • disconnect the warning light panel 16WN2.
       1 If the warning light panel 16WN1 do not flash:
  • do a check for a short to ground at pin C of the connector of the warning light panel 16WN2.
         a If there is a short to ground:
  • do a check and repair the wiring from the cabin pressure detection pressure switch pin B 14WN to the warning light panel 16WN2 pin C ASM 527302.
         b If there is no short to ground:
       2 If the warning light panel 16WN1 flashes:
  • do a check for a short to ground at pin D of the connector of the warning light panel 16WN2 ASM 527302,
  • disconnect the connector of the warning light panel 19WN1 and do a check for a short to ground at pin C of the connector of the warning light panel 19WN1 ASM 527302.
         a If there is a short to ground:
  • do a check and repair the wiring from the warning light panel 16WN2 pin D to the warning light panel 16WN1 pin C ASM 527302,
  • do a check and repair the wiring from the warning light panel 16WN1 pin D to the warning light panel 17WN1 pin C ASM 527302.
         b If there is no short to ground:
Subtask 52-73-00-810-053-A ** ON A/C NOT FOR ALL
B. If the CABIN PRESSURE warning light panels flash or do not flash with overpressure:
  • disconnect the connector of the cabin pressure detection pressure switch 14WN and install a jumper wire between pin B and C.
   (1) If the warning light panels of the doors flash:
   (2) If the warning light panels of the doors do not flash:
  • connect the connector of the cabin pressure detection pressure switch 14WN again and disconnect pin A/B of the relay 18WN1.
     (a) If the warning light panels of the doors flash:
  • connect pin A/B of the relay 18WN1 again,
  • disconnect pin A/Z of the relay 3EN2,
  • do a check for 28VDC at the relay 18WN2 pin A/X.
       1 If there is 28VDC:
  • do a check for ground at pin G of the connector of the warning light panel 16WN1.
         a If there is ground:
         b If there is no ground:
  • repair the wiring ASM 527302 between:
    .the warning light panel 16WN1 pin G and the relay 18WN2 pin A/B
    .the relay 18WN2 pin A/3 and the ground.
       2 If there is no 28VDC:
         a If the fault continues:
  • repair the wiring ASM 527302 between:
    .the relay 3EN2 pin A/1 and the circuit breaker 2EN2
    .the relay 3EN2 pin A/A and the relay 18WN2 pin A/X.
         b If the fault continues:
  • connect pin A/Z of the relay 3EN2 again,
  • replace the CTL SW-ENG/MASTER 2 [2KC] ASM 761201.
         c If the fault continues:
  • repair the wiring ASM 793601 between:
    .the control switch 2KC pin 3A and the relay 3EN2 pin A/Z
    .the control switch 2KC pin 1A and the ground.
     (b) If the warning light panels of the doors do not flash:
  • connect pin A/B of the relay 18WN1 again,
  • disconnect pin A/Z of the relay 3EN1,
  • do a check for 28VDC at the relay 18WN1 pin A/X.
       1 If there is 28VDC:
  • do a check for ground at pin G of the connector of the warning light panel 16WN1.
         a If there is ground:
         b If there is no ground:
  • repair the wiring ASM 527302 between:
    .the warning light panel 16WN1 pin G and the relay 18WN1 pin A/B
    .the relay 18WN1 pin A/3 and the ground.
       2 If there is no 28VDC:
         a If the fault continues:
  • repair the wiring ASM 527302 between:
    .the relay 3EN1 pin A/1 and the circuit breaker 2EN1
    .the relay 3EN1 pin A/A and the relay 18WN1 pin A/X.
         b If the fault continues:
  • connect pin A/Z of the relay 3EN1 again,
  • replace the CTL SW-ENG/MASTER 1 [3KC] ASM 761201.
         c If the fault continues:
  • repair the wiring ASM 793601 between:
    .the control switch 3KC pin 3A and the relay 3EN1 pin A/Z
    .the control switch 3KC pin 1A and the ground.
Subtask 52-73-00-710-053-A ** ON A/C NOT FOR ALL
C. After the subsequent flight, make sure that the fault does not continue.
[Rev.8 from Aug 2018] 2026.04.04 04:34:55 UTC
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